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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba5813a6ee15d88a118303ae778b70eeb45d3c25797891353a8cdd496c8ac40' 
  AND token = 'Eu7ATYjt/AduFvuSS4nsPTqmNyi/N9sK55ORoyUBNTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}